ANTLIA 2" QUAD BAND LIGHT POLLUTION FILTER

Description
The Antlia Quad Band Light Pollution Filter is a light pollution suppression filter designed for both color and monochrome cameras. It allows the capture of most deep-sky objects such as galaxies, reflection nebulae, emission nebulae, and star clusters, from areas with light pollution ranging from Bortle 8 to Bortle 1. Its transmission spectrum covers the visible light region, near ultraviolet (NUV), and near infrared (NIR).

The Antlia Quad Band filter features a wide bandwidth suitable for fast optical systems, down to a focal ratio of f/2.

Considering the high quantum efficiency (QE) of modern cameras in the near infrared and the fact that this region is less affected by artificial light pollution, the Antlia Quad Band filter integrates high transmission in the NIR band. This spectral design enhances the signal-to-noise ratio and contrast of images by capturing signals in the visible and infrared bands while maintaining good color balance, thus facilitating post-production processing.

Some wide-spectrum objects like M51 and M83 emit significant signals in the near-infrared (NIR). With the Antlia Quad Band filter, it is possible to capture these deep-sky objects with more contrast, even under light-polluted skies.

If used with a camera equipped with an UV/IR cut filter, the visible band signal is well preserved, but the IR cut reduces the ability to capture targets emitting in the infrared.

Thus, the Antlia Quad Band filter is particularly suited for cameras with an AR-coated protection glass, as they allow the capture of both visible and near-infrared (NIR) signals.

Spectral specifications :

• Blocage : ≥ OD4 de 300 à 1050 nm

• Épaisseur du filtre : 2 mm ± 0,05 mm

Spectrum Curve:

The main features and application:

- Anti-Light Pollution

The Antlia Quad Band filter is an effective solution for reducing light pollution, as it cuts out most of the orange-yellow lights from 589nm and part of blue lights from LEDs

- Possible to shoot over 95% of deep sky objects

- Unique spectral design offers more possibilities for astrophotography

- High transmittance of the main emission lines Ha/SII/OIII/H-Beta in the visible region, enhances the astrophotography's high SNR and contrast;

- Near-infrared (NIR) region transmittance

- Passing near infrared region is for shooting deep sky objects that cannot be shot with other filters without NIR transmission

- The broad bandpass designed to cope with faster optics up to the f/2 focal ratio.

- Good color balance

- It is easier to achieve color balance by adding the short-wavelength transmission

- Superior optical reliability reduces post image processing

- Basic Substrate: Optical, Single / Non-glued substrate

- Surface Quality: S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830)

- Transmitted Wavefront: Lambda/4 or better.

- Parallelism: less than 30 arcsec

Not Recommended:

Solar imaging

Night visual observation

Not Permitted:

DO NOT LOOK AT THE SUN WITH THIS FILTER

Serious eye damage will result if you fail to observe the warning.